text: /*
   * HD-audio codec core device
   */
  
  #include <linux/init.h>
  #include <linux/device.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <linux/export.h>
  #include <linux/pm_runtime.h>
  #include <sound/hdaudio.h>
  #include <sound/hda_regmap.h>
  #include <sound/pcm.h>
  #include "local.h"
  
  static void setup_fg_nodes(struct hdac_device *codec);
  static int get_codec_vendor_name(struct hdac_device *codec);
  
  static void default_release(struct device *dev)
  {
  	snd_hdac_device_exit(container_of(dev, struct hdac_device, dev));
  }
  
  /**
   * snd_hdac_device_init - initialize the HD-audio codec base device
   * @codec: device to initialize
   * @bus: but to attach
   * @name: device name string
   * @addr: codec address
   *
   * Returns zero for success or a negative error code.
   *
   * This function increments the runtime PM counter and marks it active.
   * The caller needs to turn it off appropriately later.
   *
   * The caller needs to set the device's release op properly by itself.
   */
  int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
  			 const char *name, unsigned int addr)
  {
  	struct device *dev;
  	hda_nid_t fg;
  	int err;
  
  	dev = &codec->dev;
  	device_initialize(dev);
  	dev->parent = bus->dev;
  	dev->bus = &snd_hda_bus_type;
  	dev->release = default_release;
  	dev->groups = hdac_dev_attr_groups;
  	dev_set_name(dev, "%s", name);
  	device_enable_async_suspend(dev);
  
  	codec->bus = bus;
  	codec->addr = addr;
  	codec->type = HDA_DEV_CORE;
  	pm_runtime_set_active(&codec->dev);
  	pm_runtime_get_noresume(&codec->dev);
  	atomic_set(&codec->in_pm, 0);
  
  	err = snd_hdac_bus_add_device(bus, codec);
  	if (err < 0)
  		goto error;
  
  	/* fill parameters */
  	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
  					      AC_PAR_VENDOR_ID);
  	if (codec->vendor_id == -1) {
  		/* read again, hopefully the access method was corrected
  		 * in the last read...
  		 */
  		codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
  						      AC_PAR_VENDOR_ID);
  	}
  
  	codec->subsystem_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
  						 AC_PAR_SUBSYSTEM_ID);
  	codec->revision_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
  						AC_PAR_REV_ID);
  
  	setup_fg_nodes(codec);
  	if (!codec->afg && !codec->mfg) {
  		dev_err(dev, "no AFG or MFG node found\n");
  		err = -ENODEV;
  		goto error;
  	}
  
  	fg = codec->afg ? codec->afg : codec->mfg;
  
  	err = snd_hdac_refresh_widgets(codec);
  	if (err < 0)
  		goto error;
  
  	codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
  	/* reread ssid if not set by parameter */
  	if (codec->subsystem_id == -1 || codec->subsystem_id == 0)
  		snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
  			      &codec->subsystem_id);
  
  	err = get_codec_vendor_name(codec);
  	if (err < 0)
  		goto error;
  
  	codec->chip_name = kasprintf(GFP_KERNEL, "ID %x",
  				     codec->vendor_id & 0xffff);
  	if (!codec->chip_name) {
  		err = -ENOMEM;
  		goto error;
  	}
  
  	return 0;
  
   error:
  	put_device(&codec->dev);
  	return err;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_device_init);
  
  /**
   * snd_hdac_device_exit - clean up the HD-audio codec base device
   * @codec: device to clean up
   */
  void snd_hdac_device_exit(struct hdac_device *codec)
  {
  	pm_runtime_put_noidle(&codec->dev);
  	snd_hdac_bus_remove_device(codec->bus, codec);
  	kfree(codec->vendor_name);
  	kfree(codec->chip_name);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_device_exit);
  
  /**
   * snd_hdac_device_register - register the hd-audio codec base device
   * codec: the device to register
   */
  int snd_hdac_device_register(struct hdac_device *codec)
  {
  	int err;
  
  	err = device_add(&codec->dev);
  	if (err < 0)
  		return err;
  	err = hda_widget_sysfs_init(codec);
  	if (err < 0) {
  		device_del(&codec->dev);
  		return err;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_device_register);
  
  /**
   * snd_hdac_device_unregister - unregister the hd-audio codec base device
   * codec: the device to unregister
   */
  void snd_hdac_device_unregister(struct hdac_device *codec)
  {
  	if (device_is_registered(&codec->dev)) {
  		hda_widget_sysfs_exit(codec);
  		device_del(&codec->dev);
  	}
  }
  EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);
  
  /**
   * snd_hdac_make_cmd - compose a 32bit command word to be sent to the
   *	HD-audio controller
   * @codec: the codec object
   * @nid: NID to encode
   * @verb: verb to encode
   * @parm: parameter to encode
   *
   * Return an encoded command verb or -1 for error.
   */
  unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
  			       unsigned int verb, unsigned int parm)
  {
  	u32 val, addr;
  
  	addr = codec->addr;
  	if ((addr & ~0xf) || (nid & ~0x7f) ||
  	    (verb & ~0xfff) || (parm & ~0xffff)) {
  		dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
  			addr, nid, verb, parm);
  		return -1;
  	}
  
  	val = addr << 28;
  	val |= (u32)nid << 20;
  	val |= verb << 8;
  	val |= parm;
  	return val;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_make_cmd);
  
  /**
   * snd_hdac_exec_verb - execute an encoded verb
   * @codec: the codec object
   * @cmd: encoded verb to execute
   * @flags: optional flags, pass zero for default
   * @res: the pointer to store the result, NULL if running async
   *
   * Returns zero if successful, or a negative error code.
   *
   * This calls the exec_verb op when set in hdac_codec.  If not,
   * call the default snd_hdac_bus_exec_verb().
   */
  int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
  		       unsigned int flags, unsigned int *res)
  {
  	if (codec->exec_verb)
  		return codec->exec_verb(codec, cmd, flags, res);
  	return snd_hdac_bus_exec_verb(codec->bus, codec->addr, cmd, res);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_exec_verb);
  
  
  /**
   * snd_hdac_read - execute a verb
   * @codec: the codec object
   * @nid: NID to execute a verb
   * @verb: verb to execute
   * @parm: parameter for a verb
   * @res: the pointer to store the result, NULL if running async
   *
   * Returns zero if successful, or a negative error code.
   */
  int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
  		  unsigned int verb, unsigned int parm, unsigned int *res)
  {
  	unsigned int cmd = snd_hdac_make_cmd(codec, nid, verb, parm);
  
  	return snd_hdac_exec_verb(codec, cmd, 0, res);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_read);
  
  /**
   * _snd_hdac_read_parm - read a parmeter
   *
   * This function returns zero or an error unlike snd_hdac_read_parm().
   */
  int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
  			unsigned int *res)
  {
  	unsigned int cmd;
  
  	cmd = snd_hdac_regmap_encode_verb(nid, AC_VERB_PARAMETERS) | parm;
  	return snd_hdac_regmap_read_raw(codec, cmd, res);
  }
  EXPORT_SYMBOL_GPL(_snd_hdac_read_parm);
  
  /**
   * snd_hdac_read_parm_uncached - read a codec parameter without caching
   * @codec: the codec object
   * @nid: NID to read a parameter
   * @parm: parameter to read
   *
   * Returns -1 for error.  If you need to distinguish the error more
   * strictly, use snd_hdac_read() directly.
   */
  int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
  				int parm)
  {
  	int val;
  
  	if (codec->regmap)
  		regcache_cache_bypass(codec->regmap, true);
  	val = snd_hdac_read_parm(codec, nid, parm);
  	if (codec->regmap)
  		regcache_cache_bypass(codec->regmap, false);
  	return val;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_read_parm_uncached);
  
  /**
   * snd_hdac_override_parm - override read-only parameters
   * @codec: the codec object
   * @nid: NID for the parameter
   * @parm: the parameter to change
   * @val: the parameter value to overwrite
   */
  int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
  			   unsigned int parm, unsigned int val)
  {
  	unsigned int verb = (AC_VERB_PARAMETERS << 8) | (nid << 20) | parm;
  	int err;
  
  	if (!codec->regmap)
  		return -EINVAL;
  
  	codec->caps_overwriting = true;
  	err = snd_hdac_regmap_write_raw(codec, verb, val);
  	codec->caps_overwriting = false;
  	return err;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_override_parm);
  
  /**
   * snd_hdac_get_sub_nodes - get start NID and number of subtree nodes
   * @codec: the codec object
   * @nid: NID to inspect
   * @start_id: the pointer to store the starting NID
   *
   * Returns the number of subtree nodes or zero if not found.
   * This function reads parameters always without caching.
   */
  int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
  			   hda_nid_t *start_id)
  {
  	unsigned int parm;
  
  	parm = snd_hdac_read_parm_uncached(codec, nid, AC_PAR_NODE_COUNT);
  	if (parm == -1) {
  		*start_id = 0;
  		return 0;
  	}
  	*start_id = (parm >> 16) & 0x7fff;
  	return (int)(parm & 0x7fff);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_get_sub_nodes);
  
  /*
   * look for an AFG and MFG nodes
   */
  static void setup_fg_nodes(struct hdac_device *codec)
  {
  	int i, total_nodes, function_id;
  	hda_nid_t nid;
  
  	total_nodes = snd_hdac_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
  	for (i = 0; i < total_nodes; i++, nid++) {
  		function_id = snd_hdac_read_parm(codec, nid,
  						 AC_PAR_FUNCTION_TYPE);
  		switch (function_id & 0xff) {
  		case AC_GRP_AUDIO_FUNCTION:
  			codec->afg = nid;
  			codec->afg_function_id = function_id & 0xff;
  			codec->afg_unsol = (function_id >> 8) & 1;
  			break;
  		case AC_GRP_MODEM_FUNCTION:
  			codec->mfg = nid;
  			codec->mfg_function_id = function_id & 0xff;
  			codec->mfg_unsol = (function_id >> 8) & 1;
  			break;
  		default:
  			break;
  		}
  	}
  }
  
  /**
   * snd_hdac_refresh_widgets - Reset the widget start/end nodes
   * @codec: the codec object
   */
  int snd_hdac_refresh_widgets(struct hdac_device *codec)
  {
  	hda_nid_t start_nid;
  	int nums;
  
  	nums = snd_hdac_get_sub_nodes(codec, codec->afg, &start_nid);
  	if (!start_nid || nums <= 0 || nums >= 0xff) {
  		dev_err(&codec->dev, "cannot read sub nodes for FG 0x%02x\n",
  			codec->afg);
  		return -EINVAL;
  	}
  
  	codec->num_nodes = nums;
  	codec->start_nid = start_nid;
  	codec->end_nid = start_nid + nums;
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_refresh_widgets);
  
  /* return CONNLIST_LEN parameter of the given widget */
  static unsigned int get_num_conns(struct hdac_device *codec, hda_nid_t nid)
  {
  	unsigned int wcaps = get_wcaps(codec, nid);
  	unsigned int parm;
  
  	if (!(wcaps & AC_WCAP_CONN_LIST) &&
  	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
  		return 0;
  
  	parm = snd_hdac_read_parm(codec, nid, AC_PAR_CONNLIST_LEN);
  	if (parm == -1)
  		parm = 0;
  	return parm;
  }
  
  /**
   * snd_hdac_get_connections - get a widget connection list
   * @codec: the codec object
   * @nid: NID
   * @conn_list: the array to store the results, can be NULL
   * @max_conns: the max size of the given array
   *
   * Returns the number of connected widgets, zero for no connection, or a
   * negative error code.  When the number of elements don't fit with the
   * given array size, it returns -ENOSPC.
   *
   * When @conn_list is NULL, it just checks the number of connections.
   */
  int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
  			     hda_nid_t *conn_list, int max_conns)
  {
  	unsigned int parm;
  	int i, conn_len, conns, err;
  	unsigned int shift, num_elems, mask;
  	hda_nid_t prev_nid;
  	int null_count = 0;
  
  	parm = get_num_conns(codec, nid);
  	if (!parm)
  		return 0;
  
  	if (parm & AC_CLIST_LONG) {
  		/* long form */
  		shift = 16;
  		num_elems = 2;
  	} else {
  		/* short form */
  		shift = 8;
  		num_elems = 4;
  	}
  	conn_len = parm & AC_CLIST_LENGTH;
  	mask = (1 << (shift-1)) - 1;
  
  	if (!conn_len)
  		return 0; /* no connection */
  
  	if (conn_len == 1) {
  		/* single connection */
  		err = snd_hdac_read(codec, nid, AC_VERB_GET_CONNECT_LIST, 0,
  				    &parm);
  		if (err < 0)
  			return err;
  		if (conn_list)
  			conn_list[0] = parm & mask;
  		return 1;
  	}
  
  	/* multi connection */
  	conns = 0;
  	prev_nid = 0;
  	for (i = 0; i < conn_len; i++) {
  		int range_val;
  		hda_nid_t val, n;
  
  		if (i % num_elems == 0) {
  			err = snd_hdac_read(codec, nid,
  					    AC_VERB_GET_CONNECT_LIST, i,
  					    &parm);
  			if (err < 0)
  				return -EIO;
  		}
  		range_val = !!(parm & (1 << (shift-1))); /* ranges */
  		val = parm & mask;
  		if (val == 0 && null_count++) {  /* no second chance */
  			dev_dbg(&codec->dev,
  				"invalid CONNECT_LIST verb %x[%i]:%x\n",
  				nid, i, parm);
  			return 0;
  		}
  		parm >>= shift;
  		if (range_val) {
  			/* ranges between the previous and this one */
  			if (!prev_nid || prev_nid >= val) {
  				dev_warn(&codec->dev,
  					 "invalid dep_range_val %x:%x\n",
  					 prev_nid, val);
  				continue;
  			}
  			for (n = prev_nid + 1; n <= val; n++) {
  				if (conn_list) {
  					if (conns >= max_conns)
  						return -ENOSPC;
  					conn_list[conns] = n;
  				}
  				conns++;
  			}
  		} else {
  			if (conn_list) {
  				if (conns >= max_conns)
  					return -ENOSPC;
  				conn_list[conns] = val;
  			}
  			conns++;
  		}
  		prev_nid = val;
  	}
  	return conns;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_get_connections);
  
  #ifdef CONFIG_PM
  /**
   * snd_hdac_power_up - power up the codec
   * @codec: the codec object
   *
   * This function calls the runtime PM helper to power up the given codec.
   * Unlike snd_hdac_power_up_pm(), you should call this only for the code
   * path that isn't included in PM path.  Otherwise it gets stuck.
   */
  void snd_hdac_power_up(struct hdac_device *codec)
  {
  	pm_runtime_get_sync(&codec->dev);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_power_up);
  
  /**
   * snd_hdac_power_down - power down the codec
   * @codec: the codec object
   */
  void snd_hdac_power_down(struct hdac_device *codec)
  {
  	struct device *dev = &codec->dev;
  
  	pm_runtime_mark_last_busy(dev);
  	pm_runtime_put_autosuspend(dev);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_power_down);
  
  /**
   * snd_hdac_power_up_pm - power up the codec
   * @codec: the codec object
   *
   * This function can be called in a recursive code path like init code
   * which may be called by PM suspend/resume again.  OTOH, if a power-up
   * call must wake up the sleeper (e.g. in a kctl callback), use
   * snd_hdac_power_up() instead.
   */
  void snd_hdac_power_up_pm(struct hdac_device *codec)
  {
  	if (!atomic_inc_not_zero(&codec->in_pm))
  		snd_hdac_power_up(codec);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm);
  
  /**
   * snd_hdac_power_down_pm - power down the codec
   * @codec: the codec object
   *
   * Like snd_hdac_power_up_pm(), this function is used in a recursive
   * code path like init code which may be called by PM suspend/resume again.
   */
  void snd_hdac_power_down_pm(struct hdac_device *codec)
  {
  	if (atomic_dec_if_positive(&codec->in_pm) < 0)
  		snd_hdac_power_down(codec);
  }
  EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
  #endif
  
  /*
   * Enable/disable the link power for a codec.
   */
  int snd_hdac_link_power(struct hdac_device *codec, bool enable)
  {
  	if  (!codec->link_power_control)
  		return 0;
  
  	if  (codec->bus->ops->link_power)
  		return codec->bus->ops->link_power(codec->bus, enable);
  	else
  		return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_link_power);
  
  /* codec vendor labels */
  struct hda_vendor_id {
  	unsigned int id;
  	const char *name;
  };
  
  static struct hda_vendor_id hda_vendor_ids[] = {
  	{ 0x1002, "ATI" },
  	{ 0x1013, "Cirrus Logic" },
  	{ 0x1057, "Motorola" },
  	{ 0x1095, "Silicon Image" },
  	{ 0x10de, "Nvidia" },
  	{ 0x10ec, "Realtek" },
  	{ 0x1102, "Creative" },
  	{ 0x1106, "VIA" },
  	{ 0x111d, "IDT" },
  	{ 0x11c1, "LSI" },
  	{ 0x11d4, "Analog Devices" },
  	{ 0x13f6, "C-Media" },
  	{ 0x14f1, "Conexant" },
  	{ 0x17e8, "Chrontel" },
  	{ 0x1854, "LG" },
  	{ 0x1aec, "Wolfson Microelectronics" },
  	{ 0x1af4, "QEMU" },
  	{ 0x434d, "C-Media" },
  	{ 0x8086, "Intel" },
  	{ 0x8384, "SigmaTel" },
  	{} /* terminator */
  };
  
  /* store the codec vendor name */
  static int get_codec_vendor_name(struct hdac_device *codec)
  {
  	const struct hda_vendor_id *c;
  	u16 vendor_id = codec->vendor_id >> 16;
  
  	for (c = hda_vendor_ids; c->id; c++) {
  		if (c->id == vendor_id) {
  			codec->vendor_name = kstrdup(c->name, GFP_KERNEL);
  			return codec->vendor_name ? 0 : -ENOMEM;
  		}
  	}
  
  	codec->vendor_name = kasprintf(GFP_KERNEL, "Generic %04x", vendor_id);
  	return codec->vendor_name ? 0 : -ENOMEM;
  }
  
  /*
   * stream formats
   */
  struct hda_rate_tbl {
  	unsigned int hz;
  	unsigned int alsa_bits;
  	unsigned int hda_fmt;
  };
  
  /* rate = base * mult / div */
  #define HDA_RATE(base, mult, div) \
  	(AC_FMT_BASE_##base##K | (((mult) - 1) << AC_FMT_MULT_SHIFT) | \
  	 (((div) - 1) << AC_FMT_DIV_SHIFT))
  
  static struct hda_rate_tbl rate_bits[] = {
  	/* rate in Hz, ALSA rate bitmask, HDA format value */
  
  	/* autodetected value used in snd_hda_query_supported_pcm */
  	{ 8000, SNDRV_PCM_RATE_8000, HDA_RATE(48, 1, 6) },
  	{ 11025, SNDRV_PCM_RATE_11025, HDA_RATE(44, 1, 4) },
  	{ 16000, SNDRV_PCM_RATE_16000, HDA_RATE(48, 1, 3) },
  	{ 22050, SNDRV_PCM_RATE_22050, HDA_RATE(44, 1, 2) },
  	{ 32000, SNDRV_PCM_RATE_32000, HDA_RATE(48, 2, 3) },
  	{ 44100, SNDRV_PCM_RATE_44100, HDA_RATE(44, 1, 1) },
  	{ 48000, SNDRV_PCM_RATE_48000, HDA_RATE(48, 1, 1) },
  	{ 88200, SNDRV_PCM_RATE_88200, HDA_RATE(44, 2, 1) },
  	{ 96000, SNDRV_PCM_RATE_96000, HDA_RATE(48, 2, 1) },
  	{ 176400, SNDRV_PCM_RATE_176400, HDA_RATE(44, 4, 1) },
  	{ 192000, SNDRV_PCM_RATE_192000, HDA_RATE(48, 4, 1) },
  #define AC_PAR_PCM_RATE_BITS	11
  	/* up to bits 10, 384kHZ isn't supported properly */
  
  	/* not autodetected value */
  	{ 9600, SNDRV_PCM_RATE_KNOT, HDA_RATE(48, 1, 5) },
  
  	{ 0 } /* terminator */
  };
  
  /**
   * snd_hdac_calc_stream_format - calculate the format bitset
   * @rate: the sample rate
   * @channels: the number of channels
   * @format: the PCM format (SNDRV_PCM_FORMAT_XXX)
   * @maxbps: the max. bps
   * @spdif_ctls: HD-audio SPDIF status bits (0 if irrelevant)
   *
   * Calculate the format bitset from the given rate, channels and th PCM format.
   *
   * Return zero if invalid.
   */
  unsigned int snd_hdac_calc_stream_format(unsigned int rate,
  					 unsigned int channels,
  					 unsigned int format,
  					 unsigned int maxbps,
  					 unsigned short spdif_ctls)
  {
  	int i;
  	unsigned int val = 0;
  
  	for (i = 0; rate_bits[i].hz; i++)
  		if (rate_bits[i].hz == rate) {
  			val = rate_bits[i].hda_fmt;
  			break;
  		}
  	if (!rate_bits[i].hz)
  		return 0;
  
  	if (channels == 0 || channels > 8)
  		return 0;
  	val |= channels - 1;
  
  	switch (snd_pcm_format_width(format)) {
  	case 8:
  		val |= AC_FMT_BITS_8;
  		break;
  	case 16:
  		val |= AC_FMT_BITS_16;
  		break;
  	case 20:
  	case 24:
  	case 32:
  		if (maxbps >= 32 || format == SNDRV_PCM_FORMAT_FLOAT_LE)
  			val |= AC_FMT_BITS_32;
  		else if (maxbps >= 24)
  			val |= AC_FMT_BITS_24;
  		else
  			val |= AC_FMT_BITS_20;
  		break;
  	default:
  		return 0;
  	}
  
  	if (spdif_ctls & AC_DIG1_NONAUDIO)
  		val |= AC_FMT_TYPE_NON_PCM;
  
  	return val;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_calc_stream_format);
  
  static unsigned int query_pcm_param(struct hdac_device *codec, hda_nid_t nid)
  {
  	unsigned int val = 0;
  
  	if (nid != codec->afg &&
  	    (get_wcaps(codec, nid) & AC_WCAP_FORMAT_OVRD))
  		val = snd_hdac_read_parm(codec, nid, AC_PAR_PCM);
  	if (!val || val == -1)
  		val = snd_hdac_read_parm(codec, codec->afg, AC_PAR_PCM);
  	if (!val || val == -1)
  		return 0;
  	return val;
  }
  
  static unsigned int query_stream_param(struct hdac_device *codec, hda_nid_t nid)
  {
  	unsigned int streams = snd_hdac_read_parm(codec, nid, AC_PAR_STREAM);
  
  	if (!streams || streams == -1)
  		streams = snd_hdac_read_parm(codec, codec->afg, AC_PAR_STREAM);
  	if (!streams || streams == -1)
  		return 0;
  	return streams;
  }
  
  /**
   * snd_hdac_query_supported_pcm - query the supported PCM rates and formats
   * @codec: the codec object
   * @nid: NID to query
   * @ratesp: the pointer to store the detected rate bitflags
   * @formatsp: the pointer to store the detected formats
   * @bpsp: the pointer to store the detected format widths
   *
   * Queries the supported PCM rates and formats.  The NULL @ratesp, @formatsp
   * or @bsps argument is ignored.
   *
   * Returns 0 if successful, otherwise a negative error code.
   */
  int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
  				 u32 *ratesp, u64 *formatsp, unsigned int *bpsp)
  {
  	unsigned int i, val, wcaps;
  
  	wcaps = get_wcaps(codec, nid);
  	val = query_pcm_param(codec, nid);
  
  	if (ratesp) {
  		u32 rates = 0;
  		for (i = 0; i < AC_PAR_PCM_RATE_BITS; i++) {
  			if (val & (1 << i))
  				rates |= rate_bits[i].alsa_bits;
  		}
  		if (rates == 0) {
  			dev_err(&codec->dev,
  				"rates == 0 (nid=0x%x, val=0x%x, ovrd=%i)\n",
  				nid, val,
  				(wcaps & AC_WCAP_FORMAT_OVRD) ? 1 : 0);
  			return -EIO;
  		}
  		*ratesp = rates;
  	}
  
  	if (formatsp || bpsp) {
  		u64 formats = 0;
  		unsigned int streams, bps;
  
  		streams = query_stream_param(codec, nid);
  		if (!streams)
  			return -EIO;
  
  		bps = 0;
  		if (streams & AC_SUPFMT_PCM) {
  			if (val & AC_SUPPCM_BITS_8) {
  				formats |= SNDRV_PCM_FMTBIT_U8;
  				bps = 8;
  			}
  			if (val & AC_SUPPCM_BITS_16) {
  				formats |= SNDRV_PCM_FMTBIT_S16_LE;
  				bps = 16;
  			}
  			if (wcaps & AC_WCAP_DIGITAL) {
  				if (val & AC_SUPPCM_BITS_32)
  					formats |= SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE;
  				if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24))
  					formats |= SNDRV_PCM_FMTBIT_S32_LE;
  				if (val & AC_SUPPCM_BITS_24)
  					bps = 24;
  				else if (val & AC_SUPPCM_BITS_20)
  					bps = 20;
  			} else if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24|
  					  AC_SUPPCM_BITS_32)) {
  				formats |= SNDRV_PCM_FMTBIT_S32_LE;
  				if (val & AC_SUPPCM_BITS_32)
  					bps = 32;
  				else if (val & AC_SUPPCM_BITS_24)
  					bps = 24;
  				else if (val & AC_SUPPCM_BITS_20)
  					bps = 20;
  			}
  		}
  #if 0 /* FIXME: CS4206 doesn't work, which is the only codec supporting float */
  		if (streams & AC_SUPFMT_FLOAT32) {
  			formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
  			if (!bps)
  				bps = 32;
  		}
  #endif
  		if (streams == AC_SUPFMT_AC3) {
  			/* should be exclusive */
  			/* temporary hack: we have still no proper support
  			 * for the direct AC3 stream...
  			 */
  			formats |= SNDRV_PCM_FMTBIT_U8;
  			bps = 8;
  		}
  		if (formats == 0) {
  			dev_err(&codec->dev,
  				"formats == 0 (nid=0x%x, val=0x%x, ovrd=%i, streams=0x%x)\n",
  				nid, val,
  				(wcaps & AC_WCAP_FORMAT_OVRD) ? 1 : 0,
  				streams);
  			return -EIO;
  		}
  		if (formatsp)
  			*formatsp = formats;
  		if (bpsp)
  			*bpsp = bps;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_query_supported_pcm);
  
  /**
   * snd_hdac_is_supported_format - Check the validity of the format
   * @codec: the codec object
   * @nid: NID to check
   * @format: the HD-audio format value to check
   *
   * Check whether the given node supports the format value.
   *
   * Returns true if supported, false if not.
   */
  bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
  				  unsigned int format)
  {
  	int i;
  	unsigned int val = 0, rate, stream;
  
  	val = query_pcm_param(codec, nid);
  	if (!val)
  		return false;
  
  	rate = format & 0xff00;
  	for (i = 0; i < AC_PAR_PCM_RATE_BITS; i++)
  		if (rate_bits[i].hda_fmt == rate) {
  			if (val & (1 << i))
  				break;
  			return false;
  		}
  	if (i >= AC_PAR_PCM_RATE_BITS)
  		return false;
  
  	stream = query_stream_param(codec, nid);
  	if (!stream)
  		return false;
  
  	if (stream & AC_SUPFMT_PCM) {
  		switch (format & 0xf0) {
  		case 0x00:
  			if (!(val & AC_SUPPCM_BITS_8))
  				return false;
  			break;
  		case 0x10:
  			if (!(val & AC_SUPPCM_BITS_16))
  				return false;
  			break;
  		case 0x20:
  			if (!(val & AC_SUPPCM_BITS_20))
  				return false;
  			break;
  		case 0x30:
  			if (!(val & AC_SUPPCM_BITS_24))
  				return false;
  			break;
  		case 0x40:
  			if (!(val & AC_SUPPCM_BITS_32))
  				return false;
  			break;
  		default:
  			return false;
  		}
  	} else {
  		/* FIXME: check for float32 and AC3? */
  	}
  
  	return true;
  }
  EXPORT_SYMBOL_GPL(snd_hdac_is_supported_format);
  